Illumination device and ranging device

Abstract

For example, an influence of a series resonant circuit formed when a switching unit is turned off is reduced. An illumination device includes a light emission element including a first light emission unit group including a plurality of first light emission units and a second light emission unit group including a plurality of second light emission units, a first electrode of the first light emission unit group and a second electrode of the second light emission unit group made common, a first switching unit connected between a power supply and a third electrode of the first light emission unit group, a second switching unit connected between the power supply and a fourth electrode of the second light emission unit group, and at least one capacitor connected to a connection point between the power supply and the first switching unit and second switching unit.

1 . An illumination device comprising:
 a light emission element including a first light emission unit group including a plurality of first light emission units and a second light emission unit group including a plurality of second light emission units, a first electrode of the first light emission unit group and a second electrode of the second light emission unit group made common;   a first switching unit connected between a power supply and a third electrode of the first light emission unit group;   a second switching unit connected between the power supply and a fourth electrode of the second light emission unit group; and   at least one capacitor connected to a connection point between the power supply and the first switching unit and second switching unit.   
     
     
         2 . The illumination device according to  claim 1 , further comprising:
 a first capacitor connected to a connection point between the power supply and the first switching unit, and a second capacitor connected to a connection point between the power supply and the second switching unit.   
     
     
         3 . The illumination device according to  claim 1 , further comprising:
 a resistor or a transistor connected to an off-side terminal of the first switching unit; and   a resistor or a transistor connected to an off-side terminal of the second switching unit.   
     
     
         4 . The illumination device according to  claim 1 , further comprising:
 a resistor connected to a connection point between the first switching unit and the third electrode; and   a resistor connected to a connection point between the second switching unit and the fourth electrode.   
     
     
         5 . The illumination device according to  claim 1 , further comprising:
 a transistor connected to a connection point between the first switching unit and the third electrode; and   a transistor connected to a connection point between the second switching unit and the fourth electrode.   
     
     
         6 . The illumination device according to  claim 1 , wherein
 the first switching unit and the second switching unit are complementarily driven switching units.   
     
     
         7 . The illumination device according to  claim 6 , wherein
 the first switching unit and the second switching unit are transistors.   
     
     
         8 . The illumination device according to  claim 1 , wherein
 one capacitor is connected to the connection point between the power supply and the first switching unit and second switching unit.   
     
     
         9 . The illumination device according to  claim 1 , wherein
 the first switching unit, the second switching unit, and drive circuits of the first switching unit and the second switching unit are configured by one integrated circuit.   
     
     
         10 . The illumination device according to  claim 1 , wherein
 the light emission element includes a first light emission element and a second light emission element, and   the first light emission element includes the first light emission unit group, and the second light emission element includes the second light emission unit group.   
     
     
         11 . The illumination device according to  claim 1 , wherein
 a light emission pattern is switched according to light emission switching control for the light emission element.   
     
     
         12 . The illumination device according to  claim 11 , wherein
 the light emission switching control switches between a spot irradiation pattern and a uniform irradiation pattern.   
     
     
         13 . The illumination device according to  claim 11 , wherein
 a light emission region is switched according to light emission switching control for the light emission element.   
     
     
         14 . The illumination device according to  claim 12 , further comprising:
 a first optical member that makes a plurality of first light beams emitted from the plurality of first light emission units and a plurality of second light beams emitted from the plurality of second light emission units substantially parallel to emit;   a second optical member that shapes a beam shape of at least one of the plurality of first light beams or the plurality of second light beams, and emits the plurality of first light beams and the plurality of second light beams as light beams having different beam shapes; and   a third optical member that is arranged on optical paths of the plurality of first light beams and the plurality of second light beams, refracts or diffracts the plurality of first light beams to increase the number of spots with which the irradiation target is irradiated, and refracts or diffracts the plurality of second light beams to increase an overlapping range with the second light beams emitted from adjacent second light emission units,   wherein   the plurality of first light beams emitted from the plurality of first light emission units is applied to the irradiation target in the spot irradiation pattern, and   the plurality of second light beams emitted from the plurality of second light emission units is overlapped with the second light beams emitted from partially adjacent second light emission units to irradiate a predetermined range of the irradiation target with the uniform irradiation pattern.   
     
     
         15 . A ranging device comprising:
 the illumination device according to  claim 1 ;   a control unit that controls the illumination device;   a light reception unit that receives reflection light reflected by a target; and   a ranging unit that calculates a ranging distance from image data obtained by the light reception unit.